PARIS (AFP) – The cascade of catastrophe that has befallen Japan highlights the vulnerability of megacities to disaster, including fallout from a nuclear accident, say experts on urban risk. Greater Tokyo, home to 35 million people, mostly...

LOS ANGELES – The United States is boosting radiation monitoring on the West Coast and Pacific territories, as officials forecast that low levels could be detected in California by Friday. While authorities say they do not expect harmful levels,...